Add Mozilla Persona Omniauth Gem and initializer
Add (ui-only) Persona button to login modal
Add basic Persona functionality

1. No session integration yet, so automatic login/logout events are suppressed.

2. Popup blockers must be disabled: submits form to target="_blank"
Use AJAX for submitting Persona credentials.

Fixes issue with needing to unblock popups.
Make Persona configurable
add basic coding style guidelines to CONTRIBUTING.md
Fix display host for onebox
Fix weirdly indented code
Don't double-up on #main-outlet when static content is rendered through Ember
update vagrant documentation

to deal with eventual troubles while downloading the box
added the gear icon to the "Admin" button on the user page
some more extracted strings for translation
Merge pull request #350 from kubabrecka/extract_strings3

some more extracted strings for translation
Merge pull request #347 from ZogStriP/put-a-gear-button-on-it

added the gear icon to the "Admin" button on the user page
Merge pull request #346 from ZogStriP/patch-2

update vagrant documentation
Merge pull request #345 from tms/fatten-up-static-pages

Don't double-up on #main-outlet when static content is preloaded
Merge branch 'persona-integration' of git://github.com/callahad/discourse
Let's default Persona to off right now, change button text
Check when logging in whether a auth provider is enabled, including specs
Merge pull request #317 from goshakkk/contrib-coding-style

Add basic coding style guidelines to CONTRIBUTING.md